This book is the third title in the KLB Secondary Physics series. It comprehensively covers the Form Four syllabus as per the new curriculum. The edition is rich in detail, has numerous worked-out examples and puts emphasis on a practical approach. This enables the learner to appreciate more the concepts under study. Each title in the series is accompanied by a teachers’ guide which, apart from providing the teacher with vital tips on methodology, gives answers to questions in the revision exercises.